Add rpcexplorer to webapp hierarchy.

web/inc/rpcexplorer/rpc-method.html

 <!--
   Copyright 2016 The LUCI Authors. All rights reserved.
   Use of this source code is governed under the Apache License, Version 2.0
   that can be found in the LICENSE file.
-  -->
+-->
 
 <link rel="import" href="../bower_components/polymer/polymer.html">
 <link rel="import" href="../bower_components/google-signin/google-signin-aware.html">
 
-<link rel="import" href="/static/common/rpc/rpc-client.html">
+<link rel="import" href="../rpc/rpc-client.html">
 
 <link rel="import" href="rpc-descriptor-util.html">
 <link rel="import" href="rpc-editor.html">
 
 <!-- The `rpc-method` is a service method page -->
 <dom-module id="rpc-method">
   <template>
     <style>
       rpc-editor {
         height: 300px;
@@ skipping 187 matching lines @@
             isGrpcError: true,
             code: this.error.code,
             codeName: luci.rpc.CodeName(this.error.code),
             description: this.error.description
           };
         }
       }
     });
   </script>
 </dom-module>